Updated bounds on axion-like particles from X-ray observations

Schallmoser, Simon; Krippendorf, Sven; Chadha-Day, Francesca; Weller, Jochen

doi:10.1093/mnras/stac1224

Updated bounds on axion-like particles from X-ray observations

Schallmoser, Simon; Krippendorf, Sven; Chadha-Day, Francesca; Weller, Jochen

Authors

Simon Schallmoser

Sven Krippendorf

Francesca Chadha-Day francesca.chadha-day@durham.ac.uk
Assistant Professor

Jochen Weller

Abstract

In this work we revisit five different point sources within or behind galaxy clusters in order to constrain the coupling constant between axion-like particles (ALPs) and photons. We use three distinct machine learning (ML) techniques and compare our results with a standard χ2 analysis. For the first time we apply approximate Bayesian computation to searches for ALPs and find consistently good performance across ML classifiers. Further, we apply more realistic 3D magnetic field simulations of galaxy clusters and compare our results with previously used 1D simulations. We find constraints on the ALP-photon coupling at the level of state-of-the-art bounds with gaγγ ≲ 0.6 × 10−12 GeV−1, hence improving on previous constraints obtained from the same observations.

Citation

Schallmoser, S., Krippendorf, S., Chadha-Day, F., & Weller, J. (2022). Updated bounds on axion-like particles from X-ray observations. Monthly Notices of the Royal Astronomical Society, 514(1), 329-341. https://doi.org/10.1093/mnras/stac1224

Journal Article Type	Article
Acceptance Date	Apr 27, 2022
Online Publication Date	May 3, 2022
Publication Date	2022-07
Deposit Date	May 19, 2022
Publicly Available Date	May 23, 2022
Journal	Monthly Notices of the Royal Astronomical Society
Print ISSN	0035-8711
Electronic ISSN	1365-2966
Publisher	Royal Astronomical Society
Peer Reviewed	Peer Reviewed
Volume	514
Issue	1
Pages	329-341
DOI	https://doi.org/10.1093/mnras/stac1224
Related Public URLs	https://arxiv.org/abs/2108.04827

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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2022 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.